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We are sailing on the Nieuw Amsterdam with our 5 and 2 year olds. Neither is good about staying in bed. Has anyone used an inflatable bed rail? The title of the one I'm looking at on Amazon is "Shrunks Inflatable Kids Bed Rails. Safety Side Bumpers for Toddlers or Adult Beds Great for Travel. Have Your Children Sleep Safe and Comfortable." My father-in-law actually booked our cruise, so I'm not sure what type of cabin we have, but it will be economy, and there will be four of us in the cabin.